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By Achieving goals with low cost, It is in dependent on make more than campaigns for same goal and change audience demographic and interests , cost, post content . To get Best audience for you.
Basic metrics for measuring interaction on social networking sites Audience size Audience interaction Social networking site analytics Number of new followers Analysis of social networking sites related to follow-up of interaction volume
Kindly check the below link
https://blog.kissmetrics.com/social-media-measurement/